A transmission line consisting of parallel conducting plates transmits all frequencies. The TEM mode satisfies
where
is the permeability of free space and 
is the permittivity of free space. The velocity of propagation is
and the impedance is
(1)
(2)
where
is the permeability of free space and is the permittivity of free space. The velocity of propagation is (3)
and the impedance is
(4)
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